Clare and Rachel Wallmeyer, 42, died when fire swept through their home in Geelong, near Melbourne
One died in the flames while the other succumbed to severe burns on the way to hospital
Initial investigation suggests fire was not suspicious but twins had tried to kill one another before
Pair were addicted to long distance running and fractured their feet endlessly attempting marathons
Authorities considered locking sisters up to stop them starving themselves as each weighed little more than four stone
Twins predicted they would 'die together' as they transformed into living skeletons